CN103972648A - Antenna direct modulation system based on polarization refactoring - Google Patents
Antenna direct modulation system based on polarization refactoring Download PDFInfo
- Publication number
- CN103972648A CN103972648A CN201410209988.2A CN201410209988A CN103972648A CN 103972648 A CN103972648 A CN 103972648A CN 201410209988 A CN201410209988 A CN 201410209988A CN 103972648 A CN103972648 A CN 103972648A
- Authority
- CN
- China
- Prior art keywords
- antenna
- polarization
- radiation
- line
- annulus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses an antenna direct modulation system based on polarization refactoring. The antenna direct modulation system is used for wideband communication and mainly solves the problem that a traditional modulation system is narrow in communication bandwidth and poor in confidentiality. The antenna direct modulation system comprises a circular slot antenna, a communication control circuit and a dielectric substrate. The circular slot antenna comprises a feed network and a radiating body. The radiating body is composed of a radiating circular ring (6) and two rectangular grooves (8), wherein the two rectangular grooves are located at the 45-degree position and the 225-degree position of the radiating circular ring. The feed network is composed of a micro-strip feeder line (3) and a slot line (4). The radiating body and the slot line are located on the same face of the dielectric substrate, the micro-strip feeder line is located on the other face of the dielectric substrate, a carrier signal is input into the radiating body through coupling between the micro-strip feeder line (3) and the slot line (4), polarization control over an antenna radiated electromagnetic field is achieved through on and off of a communication control circuit, and the direct modulation effect based on polarization switching is formed. The antenna direct modulation system based on polarization refactoring has the communication effect of being wide in frequency band and good in direction confidentiality, and can be used for wideband communication.
Description
Technical field
The invention belongs to antenna technical field, relate in particular to a kind of antenna modulating system, can be used for broadband connections.
Background technology
As shown in Figure 2, traditional communication mode is first the modulation signal that comprises transmission information to be loaded in carrier signal by modes such as amplitude modulation, phase modulation, frequency modulation, forms the radiofrequency signal with certain bandwidth; Then, after this radiofrequency signal being processed by power amplification, phase shift etc., be fed to antenna by transmission line, then go out through aerial radiation.The bandwidth of this radiofrequency signal has determined the bandwidth of communication.Because this radiofrequency signal is through multistage transmission and radiation, so the bandwidth of communication system is to consist of the common factor of the antenna component part bandwidth such as the bandwidth of a device such as radio-frequency (RF) power amplification, phase shift and antenna feed structure, antenna matching network, aerial radiation structure.If communication bandwidth is narrower, message capacity will be subject to great restriction.In addition, because the signal difference of traditional communication mode in each radiation direction only shows as the difference of radiation intensity, be therefore easier to be intercepted and captured eavesdropping by highly sensitive receiver.
Directly antenna modulation technique (DAM, Direct Antenna Modulation) proposed first in 1999 by Fusco and Chen, and being in recent years subject to the people's such as Steven D.Keller and the Babakhani of California Institute of Technology of Duke University promotion, progressively develop the direct modulation technique in unit and the direct modulation technique of the array based on phase place based on amplitude.
Directly antenna modulation technique is directly modulated radiation signal in antenna aspect, has therefore avoided power amplifier, phase shift, feeding network, the limit bandwidth of matching network to communication system, has the ability that forms broadband connections.And be proved to be and there is certain direction confidential nature.Mainly contain at present two kinds of reactance modulation systems:
The first is the direct modulation based on amplitude, and this modulation system is by the break-make situation between communication control circuit control antenna and floor, realizes antenna work and the two kinds of situations of not working, thereby realizes amplitude modulation(PAM).Although the method is simple in structure, disguised very poor, be easy to be identified;
The second is the direct modulation based on phase place, and this modulation system normally, by controlling the phase place of element excitation in array, realizes direct communication, although this modulation system has ensured direction confidentiality, and array structure complexity.
Summary of the invention
The object of the invention is to the deficiency for above-mentioned prior art, a kind of direct antenna modulating system based on polarization reconstruct is provided, simplify modulated structure and improve concealed problem to take into account to solve simultaneously.
For achieving the above object, the present invention includes: ring slot antenna, communication control circuit and medium substrate, circumferential weld gap antenna comprises radiant body and feeding network, communication control circuit is for the radiation characteristic of control ring slot antenna; It is characterized in that:
Radiant body, is made up of radiation annulus and two rectangular channels, and the radius of this radiation annulus is inversely proportional to the resonance frequency of ring slot antenna, and these two rectangular channels lay respectively at 45 ° and 225 ° of radiation annulus and locate, and present circular polarization characteristics for making to encircle slot antenna;
Feeding network, is made up of microstrip feed line and the line of rabbet joint, and the line of rabbet joint is connected with radiation annulus, and carrier signal, by the coupled structure of microstrip feed line and the line of rabbet joint, is delivered to radiation annulus, and radiate from radiation annulus.
Further, 45 ° of axis two ends of radiation annulus are provided with interior extension gap, for connecting communication control circuit, inside prolong gap and lay respectively between radiation annulus and two rectangular channels, extension gap lays respectively at the other end of two rectangular channels, and reaches 45 ° of axis bottoms of radiation annulus always.
Further, communication control circuit comprises modulating signal source, CF signal source, two diodes and two electric capacity; Two diodes be connected between radiation annulus and two rectangular channel one end in prolong both sides, gap; Two electric capacity are connected to the both sides, extension gap of two rectangular channel other ends; Modulating signal source is connected to the both sides, bottom in extension gap; CF signal source is connected to the input of feeding network.
Further the line of rabbet joint and radiant body are positioned at the same face of medium substrate, and its upper end is connected with radiation annulus, and lower end is a circular recess, for the line of rabbet joint is carried out to impedance matching.
Further, microstrip feed line is positioned at the another side of medium substrate, and it is by two microstrip-fed compositions anyhow, and these two microstrip-fed intersections are provided with 45 ° of corner cuts, and vertical line bottom is connected with the output in CF signal source by coaxial feed dateline.
Direct antenna modulating system based on polarization reconstruct provided by the invention forms carrier wave radiation by carrier signal by microstrip feed line-line of rabbet joint coupling feed structure excitation radiation annulus; By 45 ° and the perturbation of 225 ° of positions introducing rectangle flutings formation to radiation current phase place at cannelure, gap cross-over connection diode between groove and radiation annulus simultaneously, change the perturbation of phase place by diode current flow and cut-off, form linear polarization, left-hand circular polarization/right-handed circular polarization restructural of radiation field; Modulation signal is added on to diode and forms the direct mudulation effect of switching based on polarization, realized the broadband connections effect far above traditional mixing communication mode.
The present invention has the following advantages:
(1) by the present invention due to adopt by radiation annulus and two radiator structure that rectangular channel forms, thereby can change its operating state by communication control circuit, when the diode in communication control circuit by time, rectangular channel and the conducting of radiation annulus, radiation field of aerial is circular polarization, in the time of diode current flow, rectangular channel and radiation annulus disconnect, and now radiation field of aerial is linear polarization; Realize directly modulation by this switching and control to polarization, simple in structure being easy to realized; Simultaneously owing to adopting by radiation annulus and two this radiator structure that rectangular channel forms, can make center of antenna vertical direction circular polarization effect best, along with direction of observation leaves this direction, Circular polarization ratio variation, and progressively tend to linear polarization, switch and modulation effect variation, realized direction confidentiality with this.
(2) the present invention, owing to adopting reactance modulation system, only needs to make single-frequency point carrier signal to transmit by feeding network, so whole feeding network is without carrying out the Wide-Band Design, is easy to realize impedance matching.
(3) the present invention is due to antenna is directly modulated, by the switching transmission of information of the line/circular polarization to radiation field, so be not subject to the limit bandwidth of antenna system, need not carry out the Wide-Band Design to antenna and just can realize broadband communications, greatly reduce design difficulty.
Measured result shows, the present invention is ensureing to preferably resolve the bandwidth problem of existing communication system under the simple prerequisite of modulated structure, and is beneficial to secure communication.
Brief description of the drawings
Fig. 1 is the direct modulating system structural representation that the present invention is based on polarization reconstruct;
Fig. 2 is traditional modulation schematic diagram;
Fig. 3 is reactance modulation system schematic diagram of the present invention;
Fig. 4 is that in the present invention, antenna is operated in linear polarization situation lower surface current distributing figure;
Fig. 5 is that in the present invention, antenna is operated in circular polarization situation lower surface current distributing figure;
Fig. 6 is the radiation signal spectrum measurement result comparison diagram to forming with reactance modulation system of the present invention and traditional modulation.
Concrete mode is implemented
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, the present invention includes ring slot antenna, communication control circuit and medium substrate 14, wherein:
Described dielectric substrate 14, selects double face copper, and its one side is conductive substrate 5, and another side is microstrip feed line 3.
With reference to Fig. 1 (a), described ring slot antenna, comprises feeding network and radiant body.This radiant body is made up of radiation annulus 6 and two rectangular channels 8.Radiation annulus 6 is positioned at the geometric center of conductive substrate 5, and its radius and circumferential weld gap operating frequency of antenna are inversely proportional to.Two rectangular channels 8 lay respectively at 45 ° and 225 ° of radiation annulus 6 and locate, and the length of rectangular channel 8 and wide and circular polarization operating frequency are inversely proportional to.This feeding network is made up of microstrip feed line 3 and the line of rabbet joint 4.Microstrip feed line 3 is made up of two microstrip feed lines anyhow, in order to reduce signal energy loss around the corner, the isosceles right triangle that the length of side is microstrip feed line width is cut away in its corner, i.e. shape corner cut at 45 °; The line of rabbet joint 4 upper ends are connected with radiation annulus 6, and lower end is a circular recess, are used for feed system to carry out impedance matching.It is 50 Ω that the width of microstrip feed line 3 and the line of rabbet joint 4 all meets its characteristic impedance, to reach Best Coupling effect.
Described communication control circuit, by two electric capacity 7, two diodes 9, extension gap 10, in prolong gap 11, modulating signal source 13 and CF signal source 1 and form; Inside prolong gap 11 and lay respectively between radiation annulus 6 and two rectangular channels 8, extension gap 10 lays respectively at the other end of two rectangular channels 8, and reaches 45 ° of axis bottoms of radiation annulus 6 always.By radiation annulus 6, two rectangular channels 8 and extension gap 10, in prolong gap 11 conductive substrate 5 be divided into upper left and bottom right two parts along 45 ° of axis; Two diodes 9 be connected between radiation annulus 6 and two rectangular channel 8 one end in prolong 11 both sides, gap, two electric capacity 7 are connected to 10 both sides, extension gap of two rectangular channel 8 other ends.Modulating signal source 13 is connected to the both sides, bottom in extension gap 10, by connecting line 12, modulation signal is added to the two ends of two diodes 9.CF signal source 1 is connected to the input of feeding network, by coaxial feed dateline 2, carrier signal is transferred in microstrip feed line 3.
The described line of rabbet joint 4, radiation annulus 6, two electric capacity 7, rectangular channel 8, two diodes 9, extension gap 10, inside prolong the same face that gap 11 is positioned at dielectric substrate 14, be conductive substrate 5 one sides, as Fig. 1 (a), microstrip feed line 3 is positioned at the another side of dielectric substrate, as Fig. 1 (b).
With reference to Fig. 3, modulation step of the present invention is as follows:
Step 1, carrier signal is through the transmission of radio circuit, antenna feed and matching network, and finally process antenna carries out radiation.
Carrier signal source 1 is delivered to carrier signal on microstrip feed line 3 by described coaxial feed joint 2, and the line of rabbet joint 4 feed-in radiation annulus 6 that then pass through form electromagnetic carrier radiation.
Step 2, signal transmission is modulated antenna, realizes communication by the variation transmission of information of radiation field of aerial in modulated process.
Modulating signal source 13 is added to modulation voltage at the two ends of two diodes 9, in the time of modulating signal source 13 signal intensity, two diodes 9 can switch between conducting and cut-off, and the electromagnetic wave of the annulus of radiation simultaneously 6 radiation can switch between linear polarization and circular polarization, realizes antenna modulation.
Based on above-mentioned modulation step, the antenna operation principle in the present invention is as follows:
Electromagnetic carrier radiation, by 45 ° and 225 ° of rectangle flutings 8 that introduce position at described radiation annulus 6, produces disturbance to the current phase of radiation annulus 6 both sides, and then forms circular polarization radiation field.In the time of two diode 9 conductings, antenna surface electric current as shown in Figure 4, can find out due to rectangular channel and radiating slot disconnection, almost on electric current without much impacts, CURRENT DISTRIBUTION now approaches the Surface current distribution of typical annular slot antenna, forms linear polarization electromagnetic radiation field in the both sides perpendicular to antenna surface; In the time that two diodes 9 end, rectangular channel is communicated with radiating slot, antenna surface electric current as shown in Figure 5, can find out that rectangular channel has produced obvious impact to electric current, CURRENT DISTRIBUTION changes, form left-hand circular polarization radiation field in the side perpendicular to antenna surface, opposite side forms right-handed circular polarization radiation field.
For reaching conducting and the cut-off of controlling diode, described conductive substrate 5 is divided into upper left and bottom right two parts by extension gap 10 and Nei Yan gap 11, and realized simultaneously the carrier signal between conductive substrate 5 two parts is connected and modulation signal isolation by electric capacity 7.Because the conducting effect of substrate 5 makes on diode 9 that the voltage of modulating signal source 13 is added on.In the time of modulating signal source 13 signal intensity, described diode 9 can switch between conducting and cut-off, makes the electromagnetic field of radiation annulus 6 radiation switch between linear polarization and circular polarization simultaneously, realizes directly modulation.
The present invention can be in the feature that ensures to realize under the simple and clear prerequisite of structure broadband, secure communication, and these two features can further illustrate by actual measurement and theory analysis.
1. broadband test
Using the antenna in the present invention as transmitting antenna, use respectively in the direct modulating system of the present invention shown in the traditional modulation shown in Fig. 2 and Fig. 3, change modulates signal frequency, test its radiation field frequency spectrum, in test, carrier signal is 2.04GHz, contrast the communication bandwidth of these two kinds of modulation systems, result as shown in Figure 6.Wherein:
When Fig. 6 (a) is 100MHz for modulation signal, the radiation field frequency spectrum obtaining by traditional communication mode as shown in Figure 2;
When Fig. 6 (b) is 100MHz for modulation signal, the radiation field frequency spectrum obtaining by reactance modulation system of the present invention as shown in Figure 3;
When Fig. 6 (c) is 300MHz for modulation signal, the radiation field frequency spectrum obtaining by traditional communication mode as shown in Figure 2;
When Fig. 6 (d) is 300MHz for modulation signal, the radiation field frequency spectrum obtaining by reactance modulation system of the present invention as shown in Figure 3.
Can find out from the comparison of Fig. 6 (a) and Fig. 6 (b), in the time of 100MHz, both can obtain the frequency component of 2.04 ± 0.1GHz and 2.04 ± 0.2GHz, but direct modulation antenna of the present invention can also obtain the frequency component of 2.04 ± 0.3GHz and 2.04 ± 0.4GHz, embody the latter's broadband character.
Can find out from the comparison of Fig. 6 (c) and Fig. 6 (d), in the time that modulation signal is increased to 300MHz, 2.04 ± 0.3GHz spectrum signal corresponding to the radiation field of traditional communication mode is very little, does not meet communicating requirement.But direct modulation antenna of the present invention still can obtain 2.04 ± 0.3GHz spectrum signal clearly, and this phenomenon is still set up in the time that modulation signal is brought up to 400MHz.Produce this experimental result reason and be that direct modulating system communication bandwidth is not subject to the even restriction of the beamwidth of antenna of radio circuit, antenna feed and matching network, and only depend on the speed of antenna being carried out to direct modulation.This speed of directly modulating depends on diode response speed.Therefore, relatively traditional communication, directly antenna modulation can realize broadband connections.
2. secrecy Analysis
When working in circular polarization state, the antenna of the embodiment of the present invention only in the direction vertical with antenna, presents good circular polarization effect, along with direction of observation leaves this direction, and Circular polarization ratio variation, and progressively tend to linear polarization.But this has exactly formed direction confidentiality.This be because: because the transmission of information is by the switching of polarization, therefore in antenna vertical direction linear polarization and circular polarization to switch corresponding modulation effect obvious, and in the other direction along with the variation of circular polarization characteristics, this switching modulation effect can variation.This just makes the communication error rate in antenna vertical direction lower than other directions, forms and has optionally secure communication of directivity.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, for example the present invention realizes modulation based on polarizing control, other embodiment also can comprise all direct antenna modulation of switching based on polarization, as the direct antenna modulation of the realization such as the switching based on two mutually orthogonal linear polarizations and the switching based on left-handed and right-handed circular polarization.For all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the direct antenna modulating system based on polarization reconstruct, comprises ring slot antenna, communication control circuit and medium substrate, and circumferential weld gap antenna comprises radiant body and feeding network, and communication control circuit is for the radiation characteristic of control ring slot antenna; It is characterized in that:
Radiant body, formed by radiation annulus (6) and two rectangular channels (8), the radius of this radiation annulus (6) is inversely proportional to the resonance frequency of ring slot antenna, these two rectangular channels (8) lay respectively at 45 ° and 225 ° of radiation annulus (6) and locate, and present circular polarization characteristics for making to encircle slot antenna;
Feeding network, formed by microstrip feed line (3) and the line of rabbet joint (4), the line of rabbet joint (4) is connected with radiation annulus (6), carrier signal is delivered to radiation annulus (6) by the coupled structure of microstrip feed line (3) and the line of rabbet joint (4), and radiate from radiation annulus (6).
2. the direct antenna modulating system based on polarization reconstruct as claimed in claim 1, it is characterized in that, 45 ° of axis two ends of radiation annulus (6) be provided with extension gap (10) and in prolong gap (11), for connecting control circuit.
As claimed in claim 2 based on polarization reconstruct direct antenna modulating system, in it is characterized in that, prolonging gap (11) lays respectively between radiation annulus (6) and two rectangular channels (8), extension gap (10) lays respectively at the other end of two rectangular channels (8), and reaches 45 ° of axis bottoms of radiation annulus (6) always.
4. the direct antenna modulating system based on polarization reconstruct as claimed in claim 1 or 2, it is characterized in that communication control circuit, comprise modulating signal source (13), CF signal source (1), two diodes (9) and two electric capacity (7); Two diodes (9) be connected between radiation annulus (6) and two rectangular channels (8) one end in prolong both sides, gap (11); Two electric capacity (7) are connected to the both sides, extension gap (10) of two rectangular channels (8) other end; Modulating signal source (13) is connected to the both sides, bottom in extension gap (10); CF signal source (1) is connected to the input of feeding network.
5. the direct antenna modulating system based on polarization reconstruct as claimed in claim 1, it is characterized in that the line of rabbet joint (4) and radiant body are positioned at the same face of medium substrate (14), its upper end is connected with radiation annulus (6), lower end is a circular recess, for the line of rabbet joint is carried out to impedance matching.
6. the direct antenna modulating system based on polarization reconstruct as claimed in claim 1, it is characterized in that microstrip feed line (3) is positioned at the another side of medium substrate (14), it is by two microstrip-fed compositions anyhow, these two microstrip-fed intersections are provided with 45 ° of corner cuts, and vertical line bottom is connected with the output in CF signal source by coaxial feed joint.
7. the direct antenna modulating system based on polarization reconstruct as claimed in claim 5, it is 50 Ω that the width that it is characterized in that microstrip feed line (3) and the line of rabbet joint (4) all meets its characteristic impedance, to reach Best Coupling effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410209988.2A CN103972648A (en) | 2014-05-16 | 2014-05-16 | Antenna direct modulation system based on polarization refactoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410209988.2A CN103972648A (en) | 2014-05-16 | 2014-05-16 | Antenna direct modulation system based on polarization refactoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103972648A true CN103972648A (en) | 2014-08-06 |
Family
ID=51241886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410209988.2A Pending CN103972648A (en) | 2014-05-16 | 2014-05-16 | Antenna direct modulation system based on polarization refactoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103972648A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425276A (en) * | 2017-07-21 | 2017-12-01 | 西安交通大学 | A kind of circular polarisation slot antenna with filtering characteristic |
| CN107425293A (en) * | 2017-07-19 | 2017-12-01 | 西安交通大学 | A kind of left-right-hand circular polarization restructural slot antenna |
| CN107925156A (en) * | 2016-05-28 | 2018-04-17 | 华为终端（东莞）有限公司 | Communication terminal |
| CN109256621A (en) * | 2018-11-28 | 2019-01-22 | 东南大学 | A kind of tunable chiral unit, Meta Materials and the application method of PIN-based diode |
| CN110534915A (en) * | 2019-08-16 | 2019-12-03 | 同济大学 | A kind of dynamic polarization modulator and its application method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100869754B1 (en) * | 2006-11-27 | 2008-11-21 | 한양대학교 산학협력단 | Reconfigurable multi-band antenna |
| CN102832450A (en) * | 2012-07-02 | 2012-12-19 | 上海大学 | Novel dual-frequency and polarization reconfigurable antenna |
| US8373609B1 (en) * | 2008-06-10 | 2013-02-12 | The United States Of America, As Represented By The Secretary Of The Navy | Perturbed square ring slot antenna with reconfigurable polarization |
-
2014
- 2014-05-16 CN CN201410209988.2A patent/CN103972648A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100869754B1 (en) * | 2006-11-27 | 2008-11-21 | 한양대학교 산학협력단 | Reconfigurable multi-band antenna |
| US8373609B1 (en) * | 2008-06-10 | 2013-02-12 | The United States Of America, As Represented By The Secretary Of The Navy | Perturbed square ring slot antenna with reconfigurable polarization |
| CN102832450A (en) * | 2012-07-02 | 2012-12-19 | 上海大学 | Novel dual-frequency and polarization reconfigurable antenna |
Non-Patent Citations (1)
| Title |
|---|
| MATTHIAS K. FRIES等: "A Reconfigurable Slot Antenna With Switchable Polarization", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107925156A (en) * | 2016-05-28 | 2018-04-17 | 华为终端（东莞）有限公司 | Communication terminal |
| US11283154B2 (en) | 2016-05-28 | 2022-03-22 | Huawei Device Co., Ltd. | Communications terminal |
| CN107425293A (en) * | 2017-07-19 | 2017-12-01 | 西安交通大学 | A kind of left-right-hand circular polarization restructural slot antenna |
| CN107425276A (en) * | 2017-07-21 | 2017-12-01 | 西安交通大学 | A kind of circular polarisation slot antenna with filtering characteristic |
| CN109256621A (en) * | 2018-11-28 | 2019-01-22 | 东南大学 | A kind of tunable chiral unit, Meta Materials and the application method of PIN-based diode |
| CN110534915A (en) * | 2019-08-16 | 2019-12-03 | 同济大学 | A kind of dynamic polarization modulator and its application method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103972648A (en) | Antenna direct modulation system based on polarization refactoring | |
| CN105244613B (en) | A kind of microstrip antenna | |
| CN104882674A (en) | High-isolation dual polarization differential double-frequency MIMO (Multiple-Input-Multiple-Output) antenna | |
| CN104882677B (en) | Difference gap mimo antenna with high cmrr | |
| CN105896084B (en) | A kind of full frequency band car antenna | |
| CN110931963B (en) | Method and apparatus | |
| TW201110466A (en) | Omnidirectional wideband antenna | |
| CN208637604U (en) | A kind of double-frequency omnidirectional antenna | |
| CN207217773U (en) | Antenna, emitter, reception device and wireless communication system | |
| TW201824645A (en) | Multi-band antenna and electronic device with the multi-band antenna | |
| CN109599671A (en) | A kind of coplanar wave guide feedback Dual-band circular polarization antenna | |
| CN107248617A (en) | Micro-strip paster antenna | |
| JP7430030B2 (en) | Method and apparatus | |
| KR101174825B1 (en) | Planar antenna | |
| CN104505586A (en) | Dual-frequency screen-printed triangular gap array antenna | |
| CN109390675B (en) | Antenna, transmitting apparatus, receiving apparatus, and wireless communication system | |
| KR950034898A (en) | Microstrip Antenna Elements for Wireless Communications | |
| CN102904071A (en) | L-band triple-frequency circularly polarized microstrip antenna | |
| CN207517859U (en) | A kind of duplex I-shaped slot antenna | |
| KR20160119501A (en) | Multi-band antenna | |
| US11108142B2 (en) | Antenna, transmitting antenna, receiving antenna and wireless communication device | |
| CN110649385B (en) | Microstrip antenna | |
| Nedil et al. | Design of a new mm-wave antenna fed by CPW inductively coupling for mining communication | |
| Ghosh et al. | Omni-directional printed antenna array for MIMO application | |
| RU167398U1 (en) | PLANAR DIPOLE BROADBAND ANTENNA WITH A CONNECTING DEVICE |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140806 |